Matewis: Wow ok, that does indeed seem like a bit much :P I really miss the days of single expansion packs. Tell me though, these DLCs, do they add content at the end of ME2's storyline, or does it fit content into the middle of the storyline so speak? Or perhaps both?
I don't own ME3 yet, but my ME2 is on steam.
You dont need all those DLC, Ive had playthroughs without the DLC,have to say after buying every DLC, the differences arent that huge.
Regarding ME 2 DLC: Zaeed and Kasumi are the 2 DLC characters (wont show up in ME 3 if you dont buy the DLC, maybe watch a gameplay of the DLC to see if you like those characters) and Lair of the Shadow Broker is needed (dont know if this is true) if you want to romance Liara in 3, but the rest only gives you some story bits (only buy those if youre really interested in the story or watch a gameplay video).
Regarding ME 3 DLC: If you decide to play ME 3 you dont need to buy all the DLC as well. From Ashes gives you another squadmember (+ 2 missions) and background story of this characters past: Leviathan is only worth it if youre really into the story (it deals with the creation of the main antagonists) and Omega only deals with a minor character of Mass Effect 2 and you only should buy this DLC if you liked her. Citadel is fan service and again should only be bought if you really enjoy the story and characters.
I enjoyed almost every DLC of the series, but you dont need any of the DLC to understand whats happening.